KR950007545A - Video signal scrambler and descrambler - Google Patents
Video signal scrambler and descrambler Download PDFInfo
- Publication number
- KR950007545A KR950007545A KR1019930015887A KR930015887A KR950007545A KR 950007545 A KR950007545 A KR 950007545A KR 1019930015887 A KR1019930015887 A KR 1019930015887A KR 930015887 A KR930015887 A KR 930015887A KR 950007545 A KR950007545 A KR 950007545A
- Authority
- KR
- South Korea
- Prior art keywords
- video signal
- signal
- enable
- random number
- enable pulse
- Prior art date
Links
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/16—Analogue secrecy systems; Analogue subscription systems
- H04N7/167—Systems rendering the television signal unintelligible and subsequently intelligible
- H04N7/1675—Providing digital key or authorisation information for generation or regeneration of the scrambling sequence
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/66—Digital/analogue converters
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/04—Synchronising
- H04N5/06—Generation of synchronising signals
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Theoretical Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Abstract
본 발명은 유료 텔레비젼 방송 시스템에서 제3자에 의한 불법 도청을 방지하기 위하여 영상신호를 변조하여 송신하고 가입자측에서는 변조된 영상신호를 복조하여 시청할 수 있도록 영상신호를 스크램블하는 장치와 디스크램블 하는 장치에 관한 것이다.The present invention modulates and transmits a video signal in order to prevent illegal eavesdropping by a third party in a pay-TV broadcasting system, and a device for scrambling the video signal and a descrambler for demodulating and viewing the modulated video signal. It is about.
종래의 영상신호 스크램블/디스크램블 방식은 랜덤 넘버 발생기에 의하여 발생되는 커팅 포인트에 따라 영상신호를 라인 로테이션시키는 기술로서, 라인 로테이션 처리과정에서 커팅 포인트는 예리한 절단 처리가 이루어지기 때무에 이 커팅 포인트에서 임펄스성 노이즈와 같은 잡음이 발생되고, 이 영향을 받아 디스크램블된 영상에 잔상이 남게 되어 화질이 저하되는 문제점이 있고, 라인 로테이션을 위해서는 한쌍의 라인 메모리가 요구되기 때문에 메모리 소요량이 커지게 되는 문제점이 있다.The conventional video signal scramble / descramble method is a technique of line rotation of an image signal according to a cutting point generated by a random number generator. In the line rotation process, the cutting point is sharply cut at this cutting point. Noise such as impulsive noise is generated, and the image quality is deteriorated due to the residual image remaining on the descrambled image under this influence, and the memory requirement increases because a pair of line memories are required for line rotation. There is this.
본 발명은 영상신호의수평 주사기간중에 수평 블랭킹 구간내의 수평 동기신호와 프론트 포오치(FRONT PORCH)를 랜덤하게 시간축상에 이동시켜 스크램블 처리를 수행하고, 수신측에서는 이동된 동기 신호와 프론트 포오치를 송신측과 반대 방향으로 이동시켜 디스크램블 처리를 수행하므로서 종래에 영상신호 자체의 커팅에 의한 잡음 발생을 배제하고, 고화질의 영상을 구현하며, 메모리 사용을 줄여서 원가를 절감할 수 있는 영상신호 스크램블/디스크램블 장치이다.The present invention performs scrambling by randomly moving the horizontal synchronization signal and the front porch in the horizontal blanking section between the horizontal syringes of the video signal on the time axis, and at the receiving side, the moved synchronization signal and the front porch. The video signal scramble / can be reduced in cost by eliminating the noise generated by the cutting of the video signal itself, realizing a high-quality video, and reducing the memory usage by performing the descrambling process by moving in the opposite direction to the transmitting side. Descramble device.
Description
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.
제2도의 (가), (나)는 본 발명에 의한 스크램블 파형도.(A) and (b) of FIG. 2 are scrambled waveform diagrams according to the present invention.
제3도는 본 발명의 영상신호 스크램블/디스크램블 장치의 제1실시예의 블록 구성도.3 is a block diagram of a first embodiment of a video signal scramble / descramble device of the present invention;
제4도는 본 발명 장치에서 리드 어드레스 제어수단의 블록 구성도.4 is a block diagram of read address control means in the apparatus of the present invention.
제5도는 본 발명 장치에서 제1기억수단의 블록 구성도.5 is a block diagram of a first storage means in the apparatus of the present invention.
Claims (10)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1019930015887A KR950012668B1 (en) | 1993-08-17 | 1993-08-17 | Scrambler and discrambler of image signal |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1019930015887A KR950012668B1 (en) | 1993-08-17 | 1993-08-17 | Scrambler and discrambler of image signal |
Publications (2)
Publication Number | Publication Date |
---|---|
KR950007545A true KR950007545A (en) | 1995-03-21 |
KR950012668B1 KR950012668B1 (en) | 1995-10-19 |
Family
ID=19361373
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR1019930015887A KR950012668B1 (en) | 1993-08-17 | 1993-08-17 | Scrambler and discrambler of image signal |
Country Status (1)
Country | Link |
---|---|
KR (1) | KR950012668B1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100231877B1 (en) * | 1996-09-25 | 1999-12-01 | 전주범 | Scrambling and descrambling device for front porch interval of broadcasting signal |
-
1993
- 1993-08-17 KR KR1019930015887A patent/KR950012668B1/en not_active IP Right Cessation
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100231877B1 (en) * | 1996-09-25 | 1999-12-01 | 전주범 | Scrambling and descrambling device for front porch interval of broadcasting signal |
Also Published As
Publication number | Publication date |
---|---|
KR950012668B1 (en) | 1995-10-19 |
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